How to calculate the input filter capacitor and output filter capacitor of a switching power supply? |Focus on mid-to-high-end brand capacitor manufacturers

The calculation of the input filter capacitor of a switching power supply mainly considers the range of input voltage variation. A large part of the reason is determined by the stability of the input voltage or the size of the ripple; there are many main determining factors for the calculation of the output filter capacitor of the switching power supply. The details are as follows. 1. Circuit topology, the output current ripple corresponding to each circuit topology is different. 2. Working mode, it is necessary to determine whether it is working in continuous mode or discontinuous mode. 3. Working frequency. The working flat rate is the switching frequency, which is one of the important parameters affecting the output filter capacitor. The higher the switching frequency, the smaller the output filter capacitor. . 4. The ripple size you need to achieve. According to the above options, the calculation will be easier after you specify it, and you can substitute it in the specific calculation formula.

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